<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar class="page-nav-bar" left-arrow title="黑马头条" @click-left="$router.back()"></van-nav-bar>

    <div class="main-wrap">
      <!-- 加载中 -->
      <div class="loading-wrap" v-if="loading">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>

      <!-- 加载完成-文章详情 -->
      <div class="article-detail" v-else-if="article.title">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ article.title }}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image class="avatar" slot="icon" round fit="cover" :src="article.aut_photo" />
          <div slot="title" class="user-name">{{ article.aut_name }}</div>
          <div slot="label" class="publish-date">{{ article.pubdate | relativeTime }}</div>
          <!-- <van-button
            class="follow-btn"
            round
            size="small"
            v-if="article.is_followed"
            @click="isFollowed"
            :loading="isbtnLoading"
          >已关注</van-button>
          <van-button
            v-else
            class="follow-btn"
            type="info"
            color="#3296fa"
            round
            size="small"
            icon="plus"
            @click="isFollowed"
            :loading="isbtnLoading"
          >关注</van-button>-->
          <attention-user
            class="follow-btn"
            v-model="article.is_followed"
            :autId="article.aut_id"
            @input="article.is_followed = $event"
          />
        </van-cell>
        <!-- 文章内容 -->
        <div class="article-content markdown-body" ref="articleContent" v-html="article.content"></div>
        <van-divider>正文结束</van-divider>
        <!-- 发布文章弹出层 -->
        <van-popup v-model="isShowPopup" position="bottom">
          <comment-issue :artId="article.art_id" @addComment="addComments" />
        </van-popup>
        <!-- 底部区域 -->
        <div class="article-bottom">
          <van-button
            class="comment-btn"
            type="default"
            round
            size="small"
            @click="isShowPopup=true"
          >写评论</van-button>
          <van-icon name="comment-o" :info="total" color="#777" />
          <!-- <van-icon color="#777" name="star-o" /> -->
          <collect-article
            v-model="article.is_collected"
            :artId="article.art_id"
            @input="article.is_collected = $event"
          />
          <!-- <van-icon color="#777" name="good-job-o" /> -->
          <like-article
            v-model="article.attitude"
            :artId="article.art_id"
            @input="article.attitude = $event"
          />
          <van-icon name="share" color="#777777"></van-icon>
        </div>
        <comment-list
          :artId="article.art_id"
          @total_count="total = $event.total_count"
          :list="commentList"
          @show-comment="onComment"
        />
      </div>

      <!-- 加载失败：404 -->
      <div class="error-wrap" v-else-if="errStatus===404">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div class="error-wrap" v-else>
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn">点击重试</van-button>
      </div>
    </div>
    <!-- 评论回复弹出层 -->
    <!-- 弹出层是懒加载的，只加载一次，后续的关闭和打开都不会重新刷新数据，解决办法：使用v-if重新渲染 -->
    <van-popup v-model="isShowComment" position="bottom" :style="{ height: '100%' }">
      <comment-reply :comment="commentObj" @close="isShowComment=false" v-if="isShowComment" :artId="article.art_id" :articleId="articleId"/>
    </van-popup>
  </div>
</template>

<script>
import { getArticle } from '@/api/article'
import { ImagePreview } from 'vant'
import attentionUser from '@/components/attention-user'
import collectArticle from '@/components/collect-article'
import likeArticle from '@/components/like-article'
import commentList from './components/comment-list'
import commentIssue from './components/comment-issue'
import commentReply from './components/comment-reply'
export default {
  name: 'articlePage',
  data() {
    return {
      article: {}, // 当前文章详细信息
      loading: true, // 加载状态
      errStatus: 0, // 错误状态码
      total: 0,
      isShowPopup: false, // 发布文章弹出层
      commentList: [], // 子组件的数据
      isShowComment: false,
      commentObj: {}
    }
  },
  // // 利用依赖注入向子组件传递数据(不能盲目的使用)
  // provide: function () {
  //   return {
  //     articleId: this.articleId
  //   }
  // },
  props: {
    articleId: {
      type: [Number, String, Object],
      required: true
    }
  },
  created() {
    this.loadArticle()
  },
  mounted() {},
  methods: {
    // 获取当前文章详情
    async loadArticle() {
      try {
        const { data } = await getArticle(this.articleId)
        this.article = data.data
        // 获取图片
        setTimeout(() => {
          this.preview()
        }, 0)
      } catch (err) {
        if (err.response && err.response.status === 404) {
          this.errStatus = 404
        }
      }
      // 不管文章信息是否获取成功，都要关闭加载状态
      this.loading = false
    },
    // 图片预览
    preview() {
      const content = this.$refs.articleContent
      const allImg = content.querySelectorAll('img')
      const images = []
      allImg.forEach((item, index) => {
        images.push(item.src)
        item.onclick = () => {
          ImagePreview({
            images,
            startPosition: index
          })
        }
      })
    },
    // 关闭发布文章弹出层
    addComments(res) {
      this.isShowPopup = false
      this.commentList.unshift(res.new_obj)
    },
    // 关闭回复评论弹出层和传递当前评论数据
    onComment(comment) {
      this.isShowComment = true
      this.commentObj = comment
    }
  },
  components: {
    attentionUser,
    collectArticle,
    likeArticle,
    commentList,
    commentIssue,
    commentReply
  }
}
</script>

<style scoped lang="less">
@import './github-markdown.css';
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
